Comparison of Firing Temperature on Physical Properties of Copper red Glazes by Automation Shuttle Kiln in Reduction Atmosphere
Keywords:
Glaze, Copper, Firing Temperature, Physical Properties, Reduction AtmosphereAbstract
The objective of this study was to study firing temperatures on the physical properties of copper red glazes for ceramic products. The experiment started with the Seger formula containing basic groups of 0.2mole Feldspar (K2O×Al2O3×6SiO2), 0.1mole Calcium carbonate (CaCO3), 0.1mole Barium carbonate (BaO) and 0.6-mole Zinc oxide (ZnO), the media group of 0.25 – 0.40mole Aluminum oxide (Al2O3) and an acid group of 2.0 – 4.0 mole Silicon dioxide (SiO2), coloring agent 0.3% copper carbonate (CuCO3) and 6%Tin oxide (SnO2). The copper red glaze was used in ground forms (ground for 4 hours) as an additive in the Seger formula for firing at 1250 and 1280°C. The firing condition in the reduction atmosphere can be divided into two parts. In the first part, the firing condition and atmosphere appear red color. A suitable firing condition for copper red glazes was a reduction from 950°C to 1250°C, reduction to natural firing to maximum temperature, and soaking at the highest temperature for 15 minutes.
The second part of the firing condition for copper red glazes was a reduction from 950°C to 1280°C, reduction to natural firing to maximum temperature, and soaking at the highest temperature for 15 minutes. The appearance of copper red glaze in formula 1 and 16 red colors, good melting, flow less, and not cracking, the glaze formula can be applied to the reduction firing process in an automatic kiln.
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